Chapter 6. CPU Function
6-24
6.13 External Memory Module
You can save user program safely or download user program to PLC without special handling when user program
is damaged by using external memory module in XGB PLC
.
6.13.1 Structure
6.13.2 How to use
With the following handling, you can run PLC with program saved in memory module.
(1) Save user program at external memory module
(a) Set switch of memory module as 0
(b) Install memory module at the RS-232C port of main unit
- After installation, program and parameter is saved into memory module and READ LED is on
- If Saving program and parameter is complete, READ LED is off
(c) separate memory module from main unit.
(2) Save user program of external memory module at main unit
(a) Set operation mode of main unit as STOP
- In RUN mode, you can’t save program
(b) Set switch of memory module as 1.
(c) Install memory module
- Install it at the RS-232C port of main unit.
- If PLC program and parameter is written, WRITE LED is on.
- If saving program and parameter is complete, WRITE LED is off.
(d) If you change operation mode of PLC into RUN, PLC operates with program and parameter saved in
memory module.
(3) In case LED flickers
(a) When you execute writing of memory module in case operation mode of PLC is RUN.
(WRITE LED flickers)
(b) When the PLC type of program of memory module doesn’t correspond with actual PLC type. (WRITE
LED flickers)
(c) When mode switch of memory module is not “0”, “1” (RUN LED flickers)
(d) When interface with main unit is not normal (READ LED flickers)
-. Program and parameter of XG5000, parameter and information about link enabled are all saved.
-. Don’t run PLC while external memory module is installed.
-. When READ/WRITE LED is on, don’t remove memory module.
RS-232C connector
0 : READ mode
1 : WRITE mode
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